JP2001009015A - Deodorizing element using photocatalyst - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve deodorizing performance and the regeneration efficiency of an adsorbent relating to a deodorizing element carrying a photocatalyst and the adsorbent. SOLUTION: Energy of a level at which the desorption of an odorous material does not occur is applied by using a heating means 4 to the adsorbent 2 simultaneously with the irradiation of the photocatalyst 3 with light, by which the diffusion rate of the odorous material from the adsorbent 2 to the photocatalyst 3 is increased and the deodorizing rate in a low concentration region may be improved and the deodorizing capability of the adsorbent may be efficiently regenerated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing element capable of removing contaminants such as odor components in the air by using a photocatalyst and maintaining the deodorizing performance for a long time.

[0002]

2. Description of the Related Art In recent years, in living spaces, in addition to deodorizing living odors such as cigarettes and toilets, organic substances such as measures against volatile organic substances (VOC) generated from building materials and finishing materials in newly built houses have been developed. Attention is being paid to measures against indoor air pollution caused by air pollution. In addition, there is a great deal of interest in indoor antibacterial measures, such as the nosocomial infection problem such as MRSA. As one of the measures against such deodorization and antibacterial activity, a photocatalyst that exerts a strong oxidative decomposition effect by light irradiation is used.

As a feature of the photocatalyst, it is possible to completely decompose and remove even a low-concentration odor, as long as light irradiation continues, and it does not reach an equilibrium state at a low concentration like an adsorbent. In particular, the effect of the photocatalyst is effective for malodorous substances perceived by humans on the order of ppb. However, in general, when the photocatalyst is used for deodorization, the photocatalyst is used in combination with the adsorbent because the adsorbent has lower adsorbability than the adsorbent.

[0004] The effects obtained by combining the photocatalyst and the adsorbent include securing the initial deodorizing speed and removing the odor in a low concentration region, and regenerating the deodorizing ability of the adsorbent.
The adsorbent adsorbs odorous substances on a large number of pores distributed on the surface, but as the amount of adsorption increases, the adsorption capacity decreases,
When the saturated adsorption amount is reached, the adsorption capacity is lost.

However, when an adsorbent and a photocatalyst are used in combination, the photocatalyst exhibiting a decomposing ability decomposes odorous substances present on the surface of the adsorbent and purifies the adsorbent, so that the initial adsorption performance is restored. be able to.

As a conventional deodorizing element using a combination of a photocatalyst and an adsorbent, for example, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 6-170220.

Hereinafter, the conventional deodorizing element will be described with reference to the drawings.

FIG. 9 is a schematic view of the surface of a conventional deodorizing element. In FIG. 9, reference numeral 10 denotes activated carbon used as an adsorbent for the deodorizing element. The photocatalyst 3 is supported in the outer surface of the activated carbon 10 and in pores opened on the outer surface,
11 is an odor substance adsorbed on the deodorizing element.

The photocatalyst 3 is made of an anatase type titanium dioxide (TiO ₂ ), a zinc oxide (ZnO)
And tungsten trioxide (WO ₃ ) can be used. Among them, titanium dioxide can exhibit a sufficient deodorizing function even with weak ultraviolet rays, and a wide range of substances such as ammonia, acetaldehyde, acetic acid, trimethylamine, and methyl mercaptan can be used. It is preferable because it can remove odors such as hydrogen sulfide, styrene, methyl sulfide, dimethyl disulfide and isovaleric acid.

As a method for supporting titanium dioxide as the photocatalyst 3, activated carbon 10 is immersed in a titanium-based solution formed in a sol form, and the adhered liquid on the activated carbon 10 surface after immersion is hydrolyzed to form titanium hydroxide. Then, it is dried and fired to support titanium dioxide.

The function of the deodorizing element configured as described above will be described below.

When the deodorizing element is irradiated with light such as ultraviolet rays, the holes generated on the surface of the photocatalyst 3 carried on the activated carbon 10 react with the water adsorbed on the surface of the photocatalyst 3 to form radicals OH (hydroxyl radicals). Is generated and this radical OH
By breaking molecular bonds of organic substances, odorous substances 11 such as ammonia can be oxidatively decomposed and deodorized.

When the amount of the odorant 11 is larger than the number of adsorption sites of the activated carbon 10 under light irradiation, the photocatalyst 3 directly decomposes the odorant 11 and the odorant 11 is adsorbed in the pores of the activated carbon 10. You.

When the deodorizing behavior further advances and the amount of the odorant 11 around the deodorizing element becomes smaller than the number of adsorption sites of the activated carbon 10, the photocatalyst 3, which expresses the decomposing ability by light irradiation, adsorbs on the activated carbon 10. It decomposes the odorous substances 11 and purifies the activated carbon 10.

The specific purification behavior is as follows.
When the odor substance 11 present in the surroundings is decomposed, the photocatalyst 3
The vicinity becomes a low-concentration atmosphere, and a concentration gradient is generated between the atmosphere and a place away from the photocatalyst 3. When the concentration gradient occurs, the odorant 11 diffuses to a low concentration portion where the photocatalyst 3 is supported in order to keep the concentration on the surface of the activated carbon 10 in equilibrium. The odor substance 11 adsorbed on the surface of the activated carbon 10 is completely decomposed, and the adsorption capacity of the activated carbon 10 is regenerated.

[0016]

However, in the above-mentioned conventional structure, the diffusion rate of the odorant 11 adsorbed on the activated carbon 10 toward the photocatalyst 3 is limited only by the concentration gradient generated between the periphery of the activated carbon 10 and the periphery of the photocatalyst 3. Activated carbon 10 having a large surface area generally has an odorant 11
However, there is a problem that a great amount of time is required until the material comes into contact with the photocatalyst 3, and as a result, the deodorizing ability is reduced and the regeneration speed of the adsorbent is reduced.

The present invention solves the conventional problems. By increasing the diffusion rate of odorous substances from an adsorbent to a photocatalyst, the deodorization rate in a low concentration range is improved, and the deodorizing ability of the adsorbent is improved. An object of the present invention is to provide a deodorizing element that can be efficiently regenerated.

Another object of the present invention is to efficiently transfer heat from the heating means to the adsorbent, and to uniformly heat the entire adsorbent in a short period of time. An object of the present invention is to provide a deodorizing element capable of further increasing the rate of diffusion of odorous substances from water to a photocatalyst, further improving the deodorizing rate in a low-concentration range, and the deodorizing performance of an adsorbent more efficiently.

Another object of the present invention is to increase the carrying amount of the adsorbent and the photocatalyst by increasing the surface area of the structure, thereby further improving the deodorizing performance when no light is irradiated and the photocatalytic effect when light is irradiated. An object of the present invention is to provide a deodorizing element that can be used.

Further, in the above-described conventional configuration, when light is irradiated to the photocatalyst 3 on the deodorizing element in an intermittent manner from the viewpoint of energy saving, the regeneration of the deodorizing ability of the activated carbon 10 is slow. Complete purification of 10 would be difficult. When this is repeated, the odorant 11 accumulates in the activated carbon 10, so that the adsorption equilibrium concentration increases,
When not only the deodorization ability is reduced but also a certain amount of energy is added to the activated carbon 10 due to a change in temperature or the like,
There is a problem that the adsorbed odor substance 11 is easily desorbed to the gas phase side.

The present invention solves the conventional problem. When light is not irradiated, the adsorbent is cooled through a structure using a cooling means, thereby improving the deodorizing ability of the adsorbent and reducing the temperature. Prevents the temperature of the adsorbent from rising due to changes in
An object of the present invention is to provide a deodorizing element capable of suppressing odorous substances from desorbing.

Another object of the present invention is to provide a heating device and a cooling device comprising a Peltier-type temperature control element, so that a single module can be used as an adsorbent in accordance with the presence or absence of light irradiation on the photocatalyst. It is an object of the present invention to provide a deodorizing element capable of improving the deodorizing ability, efficiently regenerating the deodorizing performance, and reducing the number of parts to reduce the cost by performing cooling and heating.

[0023]

In order to achieve this object, the present invention irradiates a photocatalyst with light and, at the same time, uses a heating means for an adsorbent so that desorption of odorous substances does not occur. It is configured to apply a level of energy.

As a result, the rate of diffusion of the odorous substance from the adsorbent to the photocatalyst is increased, the deodorizing rate in a low concentration range is improved, and the deodorizing ability of the adsorbent can be efficiently regenerated.

In the present invention, a material having a thermal conductivity of 30 W / (m · K) or more at a temperature of 300 K is used as a material of the structure.

Thus, heat can be efficiently transferred from the heating means to the structure, and the entire adsorbent can be uniformly heated in a short time. As a result, odorous substances can be transferred from the adsorbent to the photocatalyst. The diffusion rate is further increased, the deodorizing rate in a low concentration range is further improved, and the deodorizing ability can be more efficiently regenerated.

In the present invention, irregularities larger than the particle diameter of the adsorbent are provided on the surface of the structure.

This increases the surface area of the structure,
More adsorbents and photocatalysts can be supported, and the deodorizing performance when no light is irradiated and the photocatalytic effect when light is irradiated can be further improved.

In the present invention, in addition to the heating means, the cooling means is provided so as to transfer heat to the structure.

Thus, when the light is not irradiated, the adsorbent is cooled by the cooling means through the structure, thereby improving the deodorizing ability of the adsorbent, and reducing the temperature rise of the adsorbent due to a change in air temperature. Prevention and elimination of odorous substances can be suppressed.

Further, the present invention uses a Peltier-type temperature control element as the heating means and the cooling means.

Thus, the temperature of the adsorbent is controlled by a single module in accordance with the presence or absence of light irradiation on the photocatalyst, thereby improving the deodorizing ability and efficiently regenerating the deodorizing performance of the adsorbent. Cost reduction can be achieved by reducing the number of points.

[0033]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention comprises a structure, an adsorbent, a photocatalyst, and a heating means, and the adsorbent and the photocatalyst are uniformly formed on the surface of the structure. And the heating means is unified in a form capable of transferring heat to the structure, and the heating means has a level at which desorption of the odor substance does not occur with respect to the adsorbent which has adsorbed the odor substance. Energy is applied, and even when a large amount of odorous substance is adsorbed on the pores on the surface of the adsorbent, when the photocatalyst is irradiated with light having an ultraviolet wavelength, the photocatalyst exhibits oxidative decomposition power, and the photocatalyst exhibits In order to decompose the adsorbed odor substance, the surrounding area of the photocatalyst becomes a low concentration atmosphere and a concentration gradient is generated between the adsorbent and the photocatalyst, and the odor substance is continuously diffused to the photocatalyst side. At the same time, the odor is absorbed by the adsorbent through the structure by the heating means. Diffusion rate of odorant increases by adding energy levels desorption of material does not occur,
The deodorizing speed in the low concentration range is improved, and the deodorizing ability of the adsorbent can be efficiently regenerated.

According to a second aspect of the present invention, in the first aspect, a material having a thermal conductivity of 30 W / (m · K) or more at a temperature of 300 K is used as a material of the structure. When the structure is heated by the heating means together with the light irradiation, the heat is efficiently transferred to the structure, and the entire adsorbent is uniformly heated in a short time, so that the odorous substance Has an effect that the rate of diffusion from the adsorption site to the photocatalyst is further increased, and as a result, the deodorizing rate in a low concentration range is further improved, and the deodorizing ability of the adsorbent can be more efficiently regenerated.

According to a third aspect of the present invention, in the first or second aspect of the present invention, irregularities larger than the particle diameter of the adsorbent are provided on the surface of the structure, thereby increasing the surface area of the structure. Thus, more adsorbents and photocatalysts can be supported, and since the adsorption capacity increases, the deodorizing ability of the adsorbent alone when light is not irradiated can be improved. The increase in the odor can be further improved, and the light irradiation time can be reduced, so that the power consumption can be reduced.

The invention according to claim 4 is the invention according to claim 1 or 2
Or in the invention described in 3, wherein a cooling means is provided in a form in which heat is transferred to the structure, and the adsorption equilibrium concentration of the adsorbent generally decreases in proportion to a decrease in temperature. The cooling means cools the adsorbent through the structure, improves the deodorizing ability of the adsorbent, and prevents the temperature change of the odor substance on the adsorbent even when the temperature changes, so that the adsorbed odor substance Has the effect of suppressing the desorption of the compound to the gas phase.

According to a fifth aspect of the present invention, in the fourth aspect, a Peltier-type temperature control element is used as the heating means and the cooling means. By precisely cooling to a lower temperature, the deodorizing performance of the adsorbent is improved, and by reversing the direction of the current flowing through the temperature control element, heating can be performed in the same way, so the diffusion rate of odorous substances is improved. It can improve the deodorizing capacity, efficiently regenerate the deodorizing performance of the adsorbent, and furthermore, because it can heat and cool with a single module, it can also reduce costs by reducing the number of parts. Has an action.

Hereinafter, embodiments of a deodorizing element according to the present invention will be described with reference to the drawings. The same components as those of the related art are denoted by the same reference numerals, and detailed description is omitted.

The photocatalyst shown in the present invention is at least one selected from the group consisting of titanium dioxide, zinc oxide, tin oxide, zirconium oxide, tungsten oxide, iron oxide, strontium titanate and barium titanate. It was used as a component. Among them, titanium dioxide is preferable because it can exhibit a sufficient deodorizing function even with weak ultraviolet light.

As a light source for developing the photocatalytic decomposition ability shown in the present invention, for example, when titanium dioxide is used as the photocatalyst, a black light or a germicidal lamp irradiating a wavelength of 400 nm or less is used. Is preferred. However, the wavelength is not limited to the above and there is no problem as long as it can irradiate a small amount of wavelength of 400 nm or less, and a fluorescent lamp may be used.

(Embodiment 1) FIG. 1 is a configuration diagram of a deodorizing element according to Embodiment 1 of the present invention. FIG. 2 is a schematic view of the surface of the deodorizing element according to the embodiment.

1 and 2, reference numeral 1 denotes a structure serving as a base material of the deodorizing element.
And the photocatalyst 3 are uniformly supported. Reference numeral 4 denotes a heating means, and a heat transfer coil heater, a wire heater, a surface heater, or the like can be applied.

Reference numeral 5 denotes a housing for assembling the structure 1 and the heating means 4 and is fixed to the housing 5 so that the entire outer frame of the structure 1 is in contact with the housing. It is installed in contact with a part of the body. The material of the housing 5 is
When a stainless steel or aluminum metal is used, the heat of the heating means 4 can be efficiently transmitted to the entire housing 5,
It is also excellent in corrosion resistance.

The structure 1 is composed of the structure 1 and the odorant 11.
It is preferable to form a honeycomb-shaped cross section from the viewpoint of increasing the contact rate with the honeycomb structure. Further, as a material of the structure 1, it is preferable to apply a material having a thermal conductivity of 30 W / (m · K) or more. For example, ceramic, metal or the like can be applied. It is more preferable to use a stainless steel or aluminum metal in view of the fact that it can be transmitted uniformly and in a short time and the corrosion resistance.

The adsorbent 2 preferably has silica (SiO ₂ ) and alumina (Al ₂ O ₃ ) as main components and a silica component ratio larger than alumina. The adsorbent 2 is
Since silica and alumina are the main components, the appearance is white and it is difficult to absorb ultraviolet rays. For this reason, light is hardly absorbed by the adsorbent 2, and light can be efficiently irradiated to the photocatalyst 3.

As a method for supporting the adsorbent 2 and the photocatalyst 3 on the structure 1, a dispersion of the adsorbent 2 and a dispersion of the photocatalyst 3 in which respective powders are uniformly dispersed in a solvent for each of the adsorbent 2 and the photocatalyst 3 are used. It is desirable to repeat the process of preparing, then immersing the structure 1 in the dispersion, removing excess liquid, and drying at 150 ° C. or higher for each of the adsorbent 2 dispersion and the photocatalyst 3 dispersion.

As for the solvent to be dispersed, if a solvent containing a binder capable of fixing the adsorbent 2 and the photocatalyst 3 to the structure 1 is used, the solvent can be firmly supported. The loading amounts of the adsorbent 2 and the photocatalyst 3 on the structure 1 can be adjusted by changing the weight concentration of the powder dispersed in the solvent.

In the present embodiment, the photocatalyst 3 is fixed on the structure 1 by using a binder. However, when titanium dioxide is supported as the photocatalyst 3, the photocatalyst 3 is placed in a titanium-based solution formed in a sol form. Alternatively, the structure 1 supporting the adsorbent 2 may be immersed, and the liquid attached to the structure 1 after immersion may be hydrolyzed to titanium hydroxide, and then dried and fired to carry the structure.

When a metal material is used for the structure 1,
Before processing into a honeycomb structure, 50
By performing a sandblasting process in which aluminum oxide beads of a mesh size are jetted at high speed, irregularities larger than the particle diameter of the adsorbent are provided on the surface of the base material, and as a result, the surface area of the base material increases. By forming the structure 6 using the base material, the adsorbent 2 and the photocatalyst 3 can be more supported as shown in FIG.

The operation of the deodorizing element configured as described above will be described below with reference to FIGS.

When the air containing the odor substance 11 is passed while irradiating the light having the ultraviolet wavelength to the ventilation surface of the structure 1, the odor substance 11 is adsorbed by the adsorbent 2,
Alternatively, it is decomposed into water and carbon dioxide by directly contacting the photocatalyst 3 which has developed oxidative decomposition power. Further, the odorous substance 11 on the adsorbent is also decomposed by diffusion and contact toward the photocatalyst 3 due to the concentration gradient with the vicinity of the photocatalyst 3, and therefore, as shown in FIG. The odorant continues to be reduced without causing odor.

Further, the heating means 4 heats the adsorbent 2 via the housing 5 and the structure 1 by applying energy smaller than the heat of adsorption of the odorant 11 to the adsorbent 2 and irradiates the adsorbent 2 with light. When the air containing the odorant 11 is allowed to pass, the diffusion speed of the odorant 11 on the adsorbent toward the photocatalyst 3 is further increased as compared with the case where the heating means 4 is not provided.

The increase in the diffusion rate due to the heating will be specifically described. FIG. 5 shows a two-dimensional potential energy distribution on the surface of the adsorbent 2.

In FIG. 5, the odor substance 11 colliding with the surface of the adsorbent 2 loses the heat of adsorption q and is adsorbed on the adsorption site. The average energy of the adsorbed odorant 11 is RT
(R is a gas constant, and T is an absolute temperature). If the odorant 11 obtains energy larger than the energy wall E of the adsorption site (RT> E), it can move to an adjacent site and surface diffusion occurs. Further, the odorant 11 has a heat of adsorption q.
When a larger energy is obtained (RT> q), it desorbs from the adsorption site to the gas phase.

In this embodiment, the adsorbent 2 is heated to change the energy level RT of the odorous substance 11 to E <RT <q.
By promoting the state, the movement of the odorant 11 to the adjacent site is promoted, and the diffusion speed is increased.

As a result, the adsorption site of the adsorbent is purified at an early stage, so that the odorant 11 in the gas phase is easily adsorbed even at a low concentration, and the photocatalyst 3 is decomposed by direct contact with the odorant 11. Since the effect is added, as shown in FIG. 4, the deodorizing speed in a low concentration atmosphere of 1 ppm or less can be improved. This effect is the same even when light irradiation and heating are performed after reaching the adsorption equilibrium without initially performing light irradiation and heating, and it is possible to deodorize and regenerate the adsorbent in a short time from the equilibrium state. is there.

When stainless steel or aluminum metal is used as the material of the structure 1, the heating means 4
When the adsorbent 2 is heated by the
Can be heated to a predetermined temperature, so that the diffusion speed of the odorant 11 can be further increased, and as a result, the deodorization speed and the regeneration speed of the adsorbent can be further improved.

Further, when unevenness is provided on the surface of the structure 1 to increase the carrying amount of the adsorbent 2 and the photocatalyst 3, the time to reach the adsorption equilibrium when no light is irradiated can be extended. Further, even when light irradiation and heating are performed from the adsorption equilibrium state, since the amount of the photocatalyst 3 is increased, deodorization and regeneration of the adsorbent can be performed in a short time. As a result, the light irradiation time is short. , Leading to energy saving.

As described above, the deodorizing element of this embodiment is
The structure comprises a structure 1, an adsorbent 2, a photocatalyst 3, and a heating means 4. The adsorbent 2 and the photocatalyst 3 are uniformly supported on the structure 1. 1, wherein the heating means 4 applies energy to the adsorbent 2 which has adsorbed the odor substance 11 at a level at which desorption of the odor substance 11 does not occur. Even when a large amount of the odorant 11 is adsorbed on the pores on the surface of the adsorbent 2, when the photocatalyst 3 is irradiated with light having an ultraviolet wavelength, the photocatalyst 3 exhibits oxidative decomposition power and is adsorbed around the photocatalyst 3. Since the odorant 11 is decomposed, a low-concentration atmosphere is formed around the photocatalyst 3 and a concentration gradient is generated between the adsorbent 2 and the photocatalyst 3 so that the odorant 11 is continuously diffused to the photocatalyst 3 side. At the same time, the odor is applied to the adsorbent 2 through the structure 1 by the heating means 4. The diffusion rate of odorant 11 is increased with the addition of level energy of desorption does not occur in the quality 11 improves the deodorization rate in the low concentration range, also deodorizing ability of the adsorbent can be efficiently reproduced.

The deodorizing element of the present embodiment has a structure 1 having a thermal conductivity of 3 at a temperature of 300K.
0 W / (m · K) or more is used, and when the structure 1 is heated by the heating means 4 together with light irradiation, heat is efficiently transmitted to the structure 1. By uniformly heating the entire adsorbent 2 in a short time, the diffusion rate of the odorant 11 from the adsorption site to the photocatalyst 3 is further increased, and the deodorization rate in the low concentration region is further improved. The deodorizing ability can be regenerated more efficiently.

Further, the deodorizing element of this embodiment is
The surface of the structure 1 is provided with irregularities larger than the particle diameter of the adsorbent 2, and the surface area of the structure 1 is increased.
Since more adsorbents 2 and photocatalysts 3 can be supported and the adsorption capacity increases, the deodorizing ability of the adsorbents when light is not irradiated is improved, and the amount of photocatalyst 3 supported even when light is irradiated is increased. The decomposition efficiency of the odorant 11 can be further improved,
Further, since light irradiation time is short, power consumption can be reduced.

(Embodiment 2) FIG. 6 is a configuration diagram of a deodorizing element according to Embodiment 2 of the present invention.

In FIG. 6, 7 is a cooling means, and 8 is a blowing means. In the present embodiment, a cooling unit 7 and a blowing unit 8 are further provided in the deodorizing element according to the first embodiment.

The cooling means 7 is installed so as to be integrated with the housing 5, and the material is the same as that of the housing 5. The cooling means 7 has a structure through which the airflow from the blowing means 8 passes, and fins for increasing the contact rate with the airflow and efficiently performing heat exchange are attached to portions where the airflow passes. ing. A fan motor or the like can be applied to the blowing means 8.

The operation of the deodorizing element configured as described above will be described below.

When air containing the odorous substance 11 is allowed to pass through the ventilation surface of the structure 1 in a state where the light is not irradiated, the odorous substance 11 is adsorbed by the adsorbent 2.

When the amount of odorant 11 adsorbed increases and the concentration of odorant 11 on the surface of the adsorbent 2 and the concentration of odorant 11 in the gas phase reach a certain level, an equilibrium state is established, and
Adsorption does not proceed any further. The level of the adsorption equilibrium concentration increases and decreases in proportion to the temperature as shown in FIG.

In the present embodiment, when the light is not irradiated, the adsorbent 2 can be cooled via the housing 5 and the structure 1 by cooling the cooling means 7 by the air blowing means 8. It can be kept below room temperature. For this reason,
By reducing the adsorption equilibrium concentration of the adsorbent 2, the deodorizing performance when light is not irradiated can be improved. Further, even when the room temperature rises, the adsorbent 2 is hardly affected by the temperature change due to the effect of the cooling means 7, and the odorous substance 11 of the adsorbent 2 is hardly desorbed.

Further, even when the adsorbent 2 reaches the adsorption equilibrium, the cooling means is stopped, the light irradiation and the heating of the adsorbent 2 by the heating means 4 are performed to deodorize and adsorb the adsorbent 2 to a lower concentration. The deodorizing ability of the agent 2 can be quickly regenerated.

In the present embodiment, the heating means 4 and the cooling means 7 are separately provided, but instead, a single Peltier-type temperature control element 9 is provided in the form shown in FIG. Can be accurately cooled to a lower temperature, thereby further lowering the adsorption equilibrium concentration, and by reversing the direction of the current flowing through the temperature control element 9, heating can be performed in the same manner. The ability to improve the deodorizing ability by improving the diffusion rate of the sorbent, the efficient regeneration of the deodorizing performance of the adsorbent, and the ability to heat and cool with a single module, reduce the number of parts and reduce costs be able to.

As described above, in the present embodiment, the cooling means 7 is provided so as to be in contact with a part of the structure 1, and the adsorption equilibrium concentration of the adsorbent 2 is generally increased in proportion to the temperature decrease. From the point that the adsorbent 2 is cooled by the cooling means 7 through the structure 1 when light is not irradiated, the deodorizing ability of the adsorbent 2 is improved, and even when the temperature changes, the adsorbent 2
Since the temperature change of the odorant 11 above can be prevented,
Desorption of the adsorbed odor substance 11 to the gas phase side can be suppressed.

In the present embodiment, the Peltier-type temperature control element 9 is used as the heating means 4 and the cooling means 7, and the Peltier-type temperature control element 9 lowers the adsorbent 2 at a lower temperature. By cooling the adsorbent 2, the deodorizing performance of the adsorbent 2 is improved, and by reversing the direction of the current flowing through the temperature control element 9, heating can be performed in the same manner. The capacity can be improved, the deodorizing performance of the adsorbent 2 can be efficiently regenerated, and the heating and cooling can be performed by a single module, so that the cost can be reduced by reducing the number of parts.

[0073]

As described above, the first aspect of the present invention comprises a structure, an adsorbent, a photocatalyst, and a heating means, and the adsorbent and the photocatalyst are uniformly distributed on the surface of the structure. And the heating means are integrated in a form that transfers heat to the structure, and the heating means reacts with the adsorbent adsorbing the odorous substance.
It is designed to apply a level of energy that does not cause desorption of the odorant, and even when a large amount of the odorant is adsorbed to the pores on the surface of the adsorbent, when the photocatalyst is irradiated with light having an ultraviolet wavelength, the photocatalyst is activated. In order to decompose odor substances adsorbed around the photocatalyst by expressing oxidative decomposition power, a low concentration atmosphere is formed around the photocatalyst, and a concentration gradient is generated between the adsorbent and the photocatalyst, so that the odor substances are continuously generated. Although it diffuses to the photocatalyst side, the diffusion rate of the odorous substance increases by adding energy to the adsorbent through the structure at the same time as the light irradiation, through the structure, so that the odorant does not desorb. The deodorizing speed of the adsorbent is improved, and the deodorizing ability of the adsorbent can be efficiently regenerated.

The invention described in claim 2 is the same as that in claim 1.
In the invention described in the above, the material of the structure is a temperature of 30.
A material having a thermal conductivity of 30 W / (m · K) or more at 0K is used. When the structure is heated by the heating means together with the light irradiation, the heat transfer to the structure is reduced. By efficiently heating the entire adsorbent in a short period of time, the diffusion rate of the odorant from the adsorption site to the photocatalyst is further increased, and as a result, the deodorization rate in the low concentration region is further improved, Further, the deodorizing ability of the adsorbent can be more efficiently regenerated.

The third aspect of the present invention is the first aspect of the present invention.
Or in the invention according to 2, wherein the surface of the structure is provided with irregularities larger than the particle diameter of the adsorbent, and the surface area of the structure increases, so that more adsorbent and photocatalyst can be supported. , Because the adsorption capacity increases,
Improves the deodorizing ability of the adsorbent alone when not irradiated with light, increases the amount of photocatalyst carried, increases the odor decomposition efficiency even when irradiated with light, and consumes less light irradiation time because it requires less time for light irradiation Power can also be reduced.

The invention described in claim 4 is the first invention.
Or, in the invention described in 2 or 3, cooling means is provided in a form in which heat is transferred to the structure. Generally, the adsorption equilibrium concentration of the adsorbent becomes lower in proportion to a decrease in temperature. At the time of irradiation, the adsorbent is cooled through the structure by the cooling means to improve the deodorizing ability of the adsorbent and to prevent the temperature change of the odorous substance on the adsorbent even when the temperature changes, it is adsorbed. Desorption of the odorous substance to the gas phase can be suppressed.

Further, the invention described in claim 5 is the same as claim 4
In the invention described in (1), a Peltier-type temperature control element is used as the heating means and the cooling means, and the Peltier-type temperature control element cools the adsorbent to a lower temperature with a high degree of accuracy. Heating can be performed in the same way by improving the deodorizing performance of the gas and by reversing the direction of the current flowing through the temperature control element. Recycling can be achieved, and furthermore, since heating and cooling can be performed by a single module, cost can be reduced by reducing the number of parts.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a deodorizing element according to Embodiment 1 of the present invention.

FIG. 2 is a schematic view of the surface of the deodorizing element according to the embodiment.

FIG. 3 is a schematic view of the surface of the deodorizing element after the surface area is increased according to the embodiment.

FIG. 4 is a characteristic diagram showing a deodorizing behavior of the deodorizing element of the embodiment.

FIG. 5 is a potential energy distribution diagram on the surface of an adsorbent of the deodorizing element of the embodiment.

FIG. 6 is a configuration diagram of a deodorizing element according to a second embodiment of the present invention.

FIG. 7 is a characteristic diagram showing the relationship between the adsorption equilibrium concentration and the temperature of the deodorizing element of the example.

FIG. 8 is a configuration diagram of a deodorizing element when the Peltier-type temperature control element of the embodiment is installed.

FIG. 9 is a schematic view of the surface of a conventional deodorizing element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structure 2 Adsorbent 3 Photocatalyst 4 Heating means 7 Cooling means 9 Peltier-type temperature control element

Claims (5)

[Claims] 1. A structure, an adsorbent, a photocatalyst, and a heating means, wherein the adsorbent and the photocatalyst are uniformly supported on a surface of the structure, and the heating means transfers heat to the structure. A deodorizing element, wherein the heating means applies energy to the adsorbent to which the odor substance has been adsorbed so that the odor substance is not desorbed. 2. The deodorizing element according to claim 1, wherein a material having a thermal conductivity of 30 W / (m · K) or more at a temperature of 300 K is used as a material of the structural body. 3. The deodorizing element according to claim 1, wherein irregularities larger than the particle diameter of the adsorbent are provided on the surface of the structure. 4. The deodorizing element according to claim 1, wherein cooling means is provided so as to transfer heat to the structure. 5. The deodorizing element according to claim 4, wherein the heating means and the cooling means are constituted by Peltier-type temperature control elements.